Flexible pellet or wood chip heating system
KWB Multifire 2Full power from wood chips or pellets
- Single- and multi-family homes
- Agriculture & forestry
- Commercial & hospitality
- 20–120 kW output
The smart all-rounder for sustainable heat
Whether fuelled with wood chips or pellets, the KWB Multifire 2 is a true all-rounder among biomass heating systems. It combines a robust design with economical fuel use and provides reliable heat from 20 to 120 kW for multi-family homes, agricultural businesses and commercial premises.
Complete flexibility when choosing fuel
The KWB Multifire 2 represents robust technology and outstanding reliability. At its heart is the KWB crawler burner, manufactured to industrial standards and operating like a conveyor belt for the fuel. High-alloy, self-cleaning cast grate components ensure durability and efficiency. The moving grate adapts easily to varying fuel qualities, allowing flexible heating with wood chips or pellets.
Economical and efficient
The KWB Multifire 2 wood chip heating system operates particularly efficiently and economically. During operation, the grate of the KWB crawler burner adapts automatically to the fuel quality and ensures combustion with virtually no unburned residue, preventing fuel from being wasted. The boiler detects the current heat demand automatically and only operates when heat is required.
Because the KWB Multifire 2 cleans itself during operation, the heat supply remains consistently stable. The heat exchanger also removes ash and cleans itself automatically. Its specially shaped turbulators ensure optimum heat transfer and high efficiency throughout the year.
Easy ash removal
For even greater convenience, an optional two-part ash box with integrated fill level monitoring is available. It can be unlocked easily and removed using practical carrying handles. Dividing the box into two containers reduces the weight of each section and makes emptying particularly easy. Thanks to clean combustion and low fuel consumption, the ash box only needs to be emptied approximately once a month.
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Technical benefits
The single-chamber cellular wheel sluice features hardened, replaceable cutting edges, a deep filling chamber and large sealing surfaces. It conveys and meters the fuel and consists of a rotor with a single chamber. This keeps the connection to the fuel supply securely sealed even while fuel is transferred to the burner, providing burn-back protection and maximising the operational reliability of the system.
The optional flue gas recirculation system is installed at the boiler’s flue gas connection. It diverts part of the cooled flue gas produced during combustion and returns it to the combustion chamber. This protects the system against wear during continuous operation and under high loads. It also cools the firebed on the grate, reducing fine dust emissions.
The KWB Multifire 2 can optionally be equipped with a 175-litre intermediate hopper that is filled automatically with wood chips from the storage room. This means the conveyor system starts less frequently and only transports wood chips when the hopper is empty, reducing both noise and electricity consumption. Where required, such as during quiet hours at night, the boiler can continue to draw fuel from this intermediate hopper.
The KWB dust filter operates according to the principle of electrostatic particle separation and removes fine dust from the flue gas. The separated filter dust is collected in a generously sized ash drawer that can be accessed conveniently and cleanly from the front. With the KWB dust filter E Plus, fluctuating fuel qualities no longer present a challenge in terms of fine dust emissions.
KWB Multifire 2 output ratings
The KWB Multifire 2 wood chip and pellet heating system is available with outputs from 20 to 120 kW:
- 20–40 kW: Ideally suited to small and medium-sized commercial applications or residential buildings with moderate heat requirements.
- 45–65 kW: Suitable for larger multi-family homes, commercial buildings or agricultural businesses with higher energy requirements.
- 70–120 kW: Particularly suitable for large industrial systems, heat suppliers or buildings with very high energy requirements.
Thanks to its high efficiency, low fuel consumption and fully automatic, low-maintenance operation, the KWB Multifire 2 provides a reliable and sustainable heat supply for a wide range of applications. All technical details and specifications can be found in the technical data.
Easy and flexible operation
The intuitive KWB Comfort 4 control system makes operation simple and provides information about the ash and fuel storage fill levels as well as the maintenance interval. It is also prepared for the integration of a solar thermal system and connection to the KWB ComfortOnline platform. This allows the boiler to be ignited and controlled remotely using a smartphone, tablet or PC.
KWB Multifire 2 in detail
KWB Multifire 2
Dual control
The KWB Comfort 4 control system can be operated via the colour touchscreen display or alternatively using the proven control dial. The dial is particularly practical when wearing work gloves. The control unit is positioned so that it is never exposed to heat, even when the combustion chamber door is open.
Easy installation
The integrated return flow temperature boost is supplied ready for connection. Its hydraulics are optimised and matched to the system.
No cleaning required
The system is fully self-cleaning during operation between service intervals.
Low emissions
Optimised flue gas routing and high combustion temperatures in the flow-optimised silicon carbide combustion chamber ensure low emissions.
Safe operation
The robust single-chamber cellular wheel sluice with a deep filling chamber provides burn-back protection, conveys and meters the fuel and maximises the operational reliability of the system.
Robust combustion system
The robust KWB crawler burner is manufactured to industrial standards. Its moving grate handles varying fuel qualities with ease, helping to minimise fuel costs.
Fuel recognition plus
Optional fuel recognition plus ensures an optimum firebed on the KWB crawler burner, even when the fuel quality varies. This supports particularly clean and efficient combustion.
Convenient ash removal
The ash container features integrated fill level monitoring. In the convenience version, it is divided into two sections, making it easier to handle and empty.
KWB Multifire 2
Dual control
The KWB Comfort 4 control system can be operated via the colour touchscreen display or alternatively using the proven control dial. The dial is particularly practical when wearing work gloves. The control unit is positioned so that it is never exposed to heat, even when the combustion chamber door is open.
Easy installation
The integrated return flow temperature boost is supplied ready for connection. Its hydraulics are optimised and matched to the system.
No cleaning required
The system is fully self-cleaning during operation between service intervals.
Low emissions
Optimised flue gas routing and high combustion temperatures in the flow-optimised silicon carbide combustion chamber ensure low emissions.
Safe operation
The robust single-chamber cellular wheel sluice with a deep filling chamber provides burn-back protection, conveys and meters the fuel and maximises the operational reliability of the system.
Robust combustion system
The robust KWB crawler burner is manufactured to industrial standards. Its moving grate handles varying fuel qualities with ease, helping to minimise fuel costs.
Fuel recognition plus
Optional fuel recognition plus ensures an optimum firebed on the KWB crawler burner, even when the fuel quality varies. This supports particularly clean and efficient combustion.
Convenient ash removal
The ash container features integrated fill level monitoring. In the convenience version, it is divided into two sections, making it easier to handle and empty.
Storage and conveyor systems for wood chips
Our wood chip storage systems and matching conveyor systems are highly adaptable and can be tailored precisely to the available space. Whether the storage room is located directly beside, above or below the heating system, further away or outside the building, there is a suitable concept for every situation.
More KWB wood chip heating systems
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